Color, like pitch in music, is a perceived quality. Just as pitch depends upon the frequency of a tone, color depends strongly on the frequency (or wavelength) of the light that reaches our eyes.
Glossary of Terms
Adjustment of rod and cone sensitivities to deal with different light levels.
Image that occurs after a stimulus is removed. Afterimages may be either positive (same color) or negative (complementary color).
Sensation of overall intensity, ranging from dark, through dim, to bright.
Color intensity; a term used by artists to mean something similar to saturation.
Ability of one part of the retina to inhibit color perception at another part.
A diagram on which any point represents the relative amount of each primary color needed to match any part of the spectrum.
A visual illusion whereby the impression of depth is conveyed in two-dimensional color images, usually of red–blue or red–green colors.
Objects tend to retain the same perceived color even though the coloration of the illumination may change.
A diagram whose vertical axis represents lightness, the distance from the axis represents saturation, and the angle represents hue.
Two colors that produce white light when added together.
Two colors that produce black when added together.
Photoreceptor that is sensitive to high light levels and differentiates between colors.
Color blindness resulting from insensitivity to green light.
Area at the center of the retina that consists almost entirely of cones.
Color name; what distinguishes one color from another.
A common test used to diagnose color deficiency.
Term used in the Ostwald color classification system; similar to brightness.
The lack of ability to distinguish colors.
A color system using ten basic hues, each of which has ten gradations, Chroma scales are of different lengths, depending on the particular hue and value.
Receptors transmit information about color pairs (blue–yellow, green–red, or black–white) by increasing or decreasing neural activity.
A color system that uses the variables of dominant wavelength, purity, and luminance. Colors are arranged so that hues of maximum purity form an equatorial circle with complementary colors opposite.
Conditions of high light level under which cone vision predominates.
Three colors that can produce white light.
Three colors that can produce black.
Color blindness resulting from insensitivity to red light.
A term used in the Munsell color system; similar to saturation.
At high light levels a red object may appear brighter than a blue object, but at low light levels the same blue object may appear brighter than the red one.
The straight line connecting the violet and red ends of the CIE diagram.
Theory originated by Edwin Land; receptors in three retinex systems are sensitive to long-, medium-, and short-wavelength light.
Photosensitive material in rods and cones.
Photoreceptor that is sensitive to low light levels but does not differentiate colors.
Purity of a color; spectral colors have the greatest saturation; white light is unsaturated.
Conditions of low light level under which rod vision predominates.
A term meaning brightness.
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